\begin{tabular}{lcccc} \hline
 & (1) & (2) & (3) & (4) \\
VARIABLES & panels\_install & panels\_install & panels\_install & panels\_install \\ \hline
 &  &  &  &  \\
price &  & -7.100*** & -6.724*** &  \\
 &  & (1.033) & (0.986) &  \\
A\_t &  & 0.00127*** & 0.00120*** &  \\
 &  & (3.79e-05) & (3.68e-05) &  \\
kwh\_ben & -1.26e-05** & 4.59e-05*** &  &  \\
 & (5.55e-06) & (6.05e-06) &  &  \\
cost & -0.000297*** & -0.000207*** & -0.000159*** & -0.000159*** \\
 & (1.63e-05) & (1.64e-05) & (1.71e-05) & (1.71e-05) \\
cost\_ben & 9.57e-05*** & 0.000130*** &  &  \\
 & (7.91e-06) & (8.28e-06) &  &  \\
unit\_ben & 5.00e-05*** & 1.77e-05 &  &  \\
 & (1.32e-05) & (1.28e-05) &  &  \\
CollPerc\_t & -0.447*** & -0.149 & -0.194 &  \\
 & (0.152) & (0.151) & (0.151) &  \\
Pol\_t & -1.424*** & -0.733*** & -0.562** &  \\
 & (0.230) & (0.231) & (0.232) &  \\
price\_ben & 9.75e-05*** &  &  &  \\
 & (6.81e-06) &  &  &  \\
skwh &  &  & 3.491*** &  \\
 &  &  & (0.597) &  \\
scost &  &  & 3.385*** &  \\
 &  &  & (0.184) &  \\
sunit &  &  & 2.67e-05 &  \\
 &  &  & (0.000239) &  \\
price\_std &  &  &  & -0.182*** \\
 &  &  &  & (0.0268) \\
A\_t\_std &  &  &  & 0.814*** \\
 &  &  &  & (0.0250) \\
skwh\_std &  &  &  & 0.164*** \\
 &  &  &  & (0.0280) \\
scost\_std &  &  &  & 0.637*** \\
 &  &  &  & (0.0346) \\
sunit\_std &  &  &  & 0.00341 \\
 &  &  &  & (0.0305) \\
CollPerc\_t\_std &  &  &  & -0.0383 \\
 &  &  &  & (0.0297) \\
Pol\_t\_std &  &  &  & -0.0876** \\
 &  &  &  & (0.0361) \\
Constant & 20.24*** & 12.32*** & 11.41*** & 11.41*** \\
 & (0.434) & (0.500) & (0.520) & (0.520) \\
 &  &  &  &  \\
Observations & 41,776 & 41,776 & 41,776 & 41,776 \\
 R-squared & 0.034 & 0.052 & 0.055 & 0.055 \\ \hline
\multicolumn{5}{c}{ Robust standard errors in parentheses} \\
\multicolumn{5}{c}{ *** p$<$0.01, ** p$<$0.05, * p$<$0.1} \\
\end{tabular}
